Acrylic pressure-sensitive adhesive compositions

Abstract

The present invention relates to an acrylic pressure-sensitive adhesive composition, and more particularly, to an acrylic pressure-sensitive adhesive composition, which comprises (a) 100 weight parts of an acrylic copolymer, (b) 0.001 to 30 weight parts of an antistatic agent; and (c) 0.01 to 10 weight parts of a corrosion inhibitor, thereby being optically transparent, causing durability and reliability not to change, and simultaneously improving antistatic performance and preventing generation of corrosion although the adhesive composition comes into contact with a metal surface.

The invention claimed is: 
     
       1. An adhesive polarizer, comprising:
 a polarizing film or polarizing device; and 
 a pressure-sensitive adhesive layer formed on one or both surfaces of the polarizing film or polarizing device, and to bond a polarizer to a liquid crystal cell, 
 wherein the pressure-sensitive adhesive layer comprises:
 (a) 100 weight parts of an acrylic copolymer; 
 (b) 0.001 to 30 weight parts of an antistatic agent; and 
 (c) 0.3 to 10 weight parts of a corrosion inhibitor that is at least one selected from the group consisting of a (benzo)thiazole-based compound; a (benzyl)imidazole-based compound; an imidazoline-based compound; a quinoline-, pyridine-, or pyrimidine-based compound; an indole-based compound or its derivative; an amine-based compound; a urea-based compound; sodiumbenzoate; benzylmercapto; di-sec-butylsulfide; and diphenylsulfoxide, and wherein the (benzo)thiazole-based compound is 2-mercaptobenzothiazole, 2-amino-3-mercapto-1,3,4 thidiazole or 1,3,4-thidiazole-2,5-dithiol, 
 
 wherein the antistatic agent is a mixture of a metal salt represented by the following Formula 7; and a compound selected from the group consisting of diethyleneglycoldi-2-ethylhexonate, tetraethyleneglycoldi-2-ethylhexonate, polyethyleneglycoldi-2-ethylhexonate, triethyleneglycoldiethylbutyrate, polyethyleneglycoldiethylbutyrate, polypropyleneglycoldiethylhexonate, triethyleneglycoldibenzonate, tetraethyleneglycol dibenzonate, polyethyleneglycoldibenzonate, polypropyleneglycoldibenzonate and polyethyleneglycol-2-ethylhexonatebenzonate:
   M + [X(YO m R f ) n ] −   [Formula 7]
 
 
 where M is lithium, sodium or potassium; 
 Rf is a perfluoroalkyl group with 1 to 4 carbon atoms; and 
 Y is carbon or sulfur, X is nitrogen or carbon, m is 1 or 2, and n is 2 or 3. 
 
     
     
       2. The adhesive polarizer as claimed in  claim 1 , wherein the acrylic copolymer comprises:
 (i) 90 to 99.9 weight parts of a (meth)acrylate ester monomer with an alkyl group having 1 to 12 carbon atoms; and 
 (ii) 0.1 to 10 weight parts of a vinyl-based monomer and/or an acryl-based monomer having a cross-linkable functional group. 
 
     
     
       3. The adhesive polarizer as claimed in  claim 1 , wherein the pressure-sensitive adhesive layer further comprises 0.01 to 10 weight parts of a polyfunctional cross-linking agent with respect to 100 weight parts of the acrylic copolymer. 
     
     
       4. The adhesive polarizer as claimed in  claim 1 , wherein the polarizer further comprising at least one layer selected from the group consisting of a protective layer, a reflective layer, an anti-glare layer, a retardation plate, a wide-viewing-angle compensation film, and a brightness enhancing film. 
     
     
       5. A liquid crystal display device comprising a liquid crystal display panel, wherein the polarizer according to  claim 1  is bonded to one or both surfaces of a liquid crystal cell.